One of the most important uses of thermal cameras is in finding moisture intrusion as seen in the image above. Moisture could be from a roof leak, a plumbing leak or even an air handler condensate drain.
The camera sees moisture as cold spots. Often, the moisture is invisible to the naked eye. I would hesitate to perform a home inspection without a thermal camera. There are other very good thermal images on this site.

That which is most often confused with thermal cameras are night vision cameras which typically utilise image intensifiers or near infrared illumination. Image intensifiers amplify the available light.
Posted by: Plumbing | July 09, 2011 at 05:34 PM